Suction pipe



E. RISLEY June 7. 1927.

SUCTION PIPE Filed April 10, 1925 Patented June 7, 1927.

UNITED STATES ELTON RISLEYQOF vnn'rnon, NEW-JERSEY.

SUCTION. mrn

Application filed April 10, 1925 Serial No. 22,159.

This invention. relates to suction pipes of the general type disclosed inU. S. Patent No. 780,027, dated January 17, 1905, and one of the objects of the present invention is to f etficient use in dredging mud and the like.

A still further object of the invention is to materially increase the efficiency over pipes- A I to which they are subjected in certain types of-work,to make the pipes extremely heavy,

of this type as previously constructed. In the attached drawings: Figure 1 is a side elevation of a pipe made in accordance with my the pipe immersed in water;

Fig. 2 is a vertical section through the 2, and h Fig. 1 is of the pipe.

With reference to the drawings, the pipe comprisesa main suction duct 1 having an open-ended outer shell 2 forming a passage on the outside of the duct 1 through which when suction is applied to the upper end of the said duct, the water is caused to circulate, the water entering the top of said outer passage and being projected down wardly against the surface against which the suction pipe 1 is directed. A suction pipe of this general character is disclosed in the aforesaid U. S. Patent No. 780,027.

In the present instance, that portion of the pipe 1 enclosed by the shell 2 is stopped short of the lower end of the pipe, and is flared outwardly, as illustrated in Fig. 2, so as to reduce the effective area of the said outer passage at its lower end. Similarly the fiaring enlarges the main duct at that point. For general purposes, it is desirable to make the cross sectional area of the outer channel at least as great as that of the main suction pipe 1, and good results have been obtained when the outer channel is reduced at the bottom in the manner described to about onehalf of the area of the main suction pipe.

to make pipes of this general character cainvention showing Fig. 3 is a section on the line 33, Fig.

V i r 1,631,761

PATENT OFFICE.-

' HEiSSUED Reduction of the effective area of the outer 5 channel in this manner has the effect of increasing the velocity of the water passing therethrough so that the scouring effect of this circulatingstream upon thesurface-or materialagainst which the suction pipe is directed is materially increased. In the present instance, I have provided at'the top of the shell '2 a series of bars 3 extending from the upper edge of the shell to the side of the suction pipe 1, and functioning as a grid to prevent solid materialbeing taken in and clogging up the lower reduced portion of the channel.

It has been'necessary heretofore, in order v pable of withstanding the blows and strains with the result" that they becamecumbersome and extremely diflicult to handle, and also expensive to manufacture. Further, by reason. of the excessive weight, it was found that the pipe, when any considerable amount of mud was encountered, became inoperative. I have dlscovered means whereby p pes of an end view from the lower endso this character may be so made as to'be entirely workable in mud, where they are particularly useful, and as to eliminate the necessity for the very heavy construction heretofore required. In practicing the invention, I suspend the pipe 1 with its attached shell 2 from an elbow 4 by means of a flexible connection or suction hose 5, as illustrated in Fig. 1, the latter being secured in any suitable manner to the said elbow4 and. the pipe 1, in the'present instance by means of clamps 6, 6. As illustrated, the suction pipe normally hangs in a practically vertical position, and with the flexible suspension is free to move in any direction, when hit by a heavy cave-in of material, without being broken. By reason of this freedom of movement, it is practicable to make the pipe 1 and shell 2 of comparatively light material, and to provide a device which is highly efli cient with mud.

It will be apparent that the pipe is capable of material modification over the herein described and illustrated embodiment without departure from the essential features of the invention. Thus'for example it is immaterial whether the shell 2 extends completely or only partly around the duct 1,

and the means for restricting the lower end of the outer duct is not to be limited to the particular method herein disclosed.

I claim: I l. A suction pipe for hydraulic dredging operations comprising a 'main duct, an auxiliary duct parallel throughout its length F'With and partially surrounding said main duct-being open at both ends and terminating adjacent the outer end of the main duct me section of reduced area, and a grid pro.

tecting the upper end of the auxiliary duct.

2. A suction pipe for dredging, comprising a main suction duct; an auxiliary duct secured to one side of said main duct and extending from the transverse bottom plane of the main duct to a point substantially adjacent the top thereof; and a flare in one side'ot the wall of the main duct, within the auxiliary duct, said flared wall terminating at a point above the coincident bottom planes of said main ductand said auxiliary duct, whereby the area of the main duct is increased and the area ot the aux-,

iliary duct is reduced, for the purpose of inducing a. downward flow through the auxiliary duct, intensifying said flow at the point of contact with the material to be removed, and directing such intensified ,fiow' against. a comparatively small area of such material. j

3. A suction pipe for dredging, comprising a main suction duct; an auxiliary duct- .secured to one side of said main duct and extending from the transverse bottom plane of the main duct to apoint substantially adjacent the top thereof; a flare in one-side of the wall of the main duct, within the auxiliary duct, said flared wall terminating at a point above the coincident bottom planes of said main duct and saidauxiliary duct, whereby the area of the main duct is increased and the area of the auxiliary duct is reduced, for the purpose of inducing a downward flow through the auxiliary duct,

intensifying said flow at the point of contact with the materlal to be removed, and directing such intensified flow against a comparatively small area of such material; andv a grid covering the upper lnlet end of said,

auxiliary duct.

4. A suction pipe for dredging, compris ing a main suction duct, an auxiliary duct secured to one side of said main duct and extending from the transverse bottom plane of the main duct to a point substantially adjacent the top thereof; a flare in one side of the wall of the main duct, within the auxiliary duct, said flared wall terminating at a point above the coincident bottom planes of said main duct and said auxiliary duct, whereby the area of the main duct is increased and the area of the auxiliarylduct 1s reduced, tor the 'purpose of 1:nduc1ng a downward flow through the auxiliary duct,

ELTON RISLEY. 

